Firstobject's free XML editor for Windows is called foxe. It loads big files (multi-megabyte) fast and lets you format XML and edit HTML and any loosely formed XML or other markup. The tree view is editable and customizable for useful navigation.
Enable snaps on Debian and install firstobject XML editor (Wine)
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Enable snapd
On Debian 9 (Stretch) and newer, snap can be installed directly from the command line: